Change kEnableAudioTrackProcessing to a disable flag and remove finch code

content/renderer/media/webrtc_audio_capturer_unittest.cc

Index: content/renderer/media/webrtc_audio_capturer_unittest.cc
diff --git a/content/renderer/media/webrtc_audio_capturer_unittest.cc b/content/renderer/media/webrtc_audio_capturer_unittest.cc
index d5f8db44b5478b497f7fc69017d5bf2588651f86..0011f7630597f323e2cb07522df7e4e269c3f1ef 100644
--- a/content/renderer/media/webrtc_audio_capturer_unittest.cc
+++ b/content/renderer/media/webrtc_audio_capturer_unittest.cc
@@ -84,9 +84,9 @@ class WebRtcAudioCapturerTest : public testing::Test {
 #endif
   }
 
-  void EnableAudioTrackProcessing() {
+  void DisableAudioTrackProcessing() {
     CommandLine::ForCurrentProcess()->AppendSwitch(
-        switches::kEnableAudioTrackProcessing);
+        switches::kDisableAudioTrackProcessing);
   }
 
   void VerifyAudioParams(const blink::WebMediaConstraints& constraints,
@@ -156,14 +156,14 @@ class WebRtcAudioCapturerTest : public testing::Test {
 
 // Pass the delay value, volume and key_pressed info via capture callback, and
 // those values should be correctly stored and passed to the track.
-TEST_F(WebRtcAudioCapturerTest, VerifyAudioParams) {
+TEST_F(WebRtcAudioCapturerTest, VerifyAudioParamsWithoutAudioProcessing) {
+  DisableAudioTrackProcessing();
   // Use constraints with default settings.
   MockMediaConstraintFactory constraint_factory;
   VerifyAudioParams(constraint_factory.CreateWebMediaConstraints(), true);
 }
 
 TEST_F(WebRtcAudioCapturerTest, VerifyAudioParamsWithAudioProcessing) {
-  EnableAudioTrackProcessing();
   // Turn off the default constraints to verify that the sink will get packets
   // with a buffer size smaller than 10ms.
   MockMediaConstraintFactory constraint_factory;
@@ -172,7 +172,6 @@ TEST_F(WebRtcAudioCapturerTest, VerifyAudioParamsWithAudioProcessing) {
 }
 
 TEST_F(WebRtcAudioCapturerTest, FailToCreateCapturerWithWrongConstraints) {
-  EnableAudioTrackProcessing();
   MockMediaConstraintFactory constraint_factory;
   const std::string dummy_constraint = "dummy";
   constraint_factory.AddMandatory(dummy_constraint, true);